Actively burning areas, detected by MODIS’s thermal bands, are outlined in red. By September 11, 2012, more than 8.2 million acres (3.3 million hectares) had burned throughout the United States, in what has proven to be one of the most severe wildfire seasons in the last decade. The only year in the last decade when more acres had burned by September 11 was 2006; at that point in the season that year, nearly 8.7 million acres had burned.